[weld-issues] [JBoss JIRA] (WELD-1074) Using `new Weld()` fails with java.lang.IncompatibleClassChangeError when Guava on classpath?

Using `new Weld()` fails with java.lang.IncompatibleClassChangeError when Guava on classpath? --------------------------------------------------------------------------------------------- Key: WELD-1074 URL: https://issues.jboss.org/browse/WELD-1074 Project: Weld Issue Type: Bug Components: Bootstrap and Metamodel API Reporter: Aled Sage I am running Weld in a vanilla JVM using `new Weld()` (having been blocked in AS 7 by https://community.jboss.org/thread/154405). I am getting the error shown below. I presume Weld is doing some special classloading that causes it to pick up Guava from somewhere other than the head of the classpath? My question/bug is: * is the classloading behaviour documented; are there things that a user must not do? * is this error caused by me having Guava ahead of the weld jar on the classpath, and if so can such errors be avoided in weld? Or is it just always necessary to avoid having Weld dependencies ahead of --- I have built Weld myself from master (1.1.6-SNAPSHOT, git commit 282f830) so have the version with guava dependency 11.0.2. (Thanks Ales for fixing that one!) --- (note I also put in an extra catch block into BeanDeployer so that it would tell me which class it was trying to load when it got this error). org.jboss.weld.resources.spi.ResourceLoadingException: Error loading class com.google.common.collect.StandardTable$ColumnMap at org.jboss.weld.resources.ClassTransformer.loadClass(ClassTransformer.java:167) at org.jboss.weld.bootstrap.BeanDeployer.addClass(BeanDeployer.java:88) at org.jboss.weld.bootstrap.BeanDeployer.addClasses(BeanDeployer.java:118) at org.jboss.weld.bootstrap.BeanDeployment.createBeans(BeanDeployment.java:171) at org.jboss.weld.bootstrap.WeldBootstrap.deployBeans(WeldBootstrap.java:336) at org.jboss.weld.environment.se.Weld.initialize(Weld.java:86) at net.ezbrokerage.launcher.EzBrokerageLauncher.<init>(EzBrokerageLauncher.java:31) at net.ezbrokerage.launcher.MontereyVenueLauncher.<init>(MontereyVenueLauncher.java:45) at net.ezbrokerage.launcher.MontereyVenueLauncher.main(MontereyVenueLauncher.java:86) Caused by: java.lang.reflect.GenericSignatureFormatError at sun.reflect.generics.parser.SignatureParser.error(SignatureParser.java:103) at sun.reflect.generics.parser.SignatureParser.parseSimpleClassTypeSignature(SignatureParser.java:262) at sun.reflect.generics.parser.SignatureParser.parseClassTypeSignatureSuffix(SignatureParser.java:270) at sun.reflect.generics.parser.SignatureParser.parseClassTypeSignature(SignatureParser.java:244) at sun.reflect.generics.parser.SignatureParser.parseFieldTypeSignature(SignatureParser.java:228) at sun.reflect.generics.parser.SignatureParser.parseTypeSignature(SignatureParser.java:359) at sun.reflect.generics.parser.SignatureParser.parseTypeSig(SignatureParser.java:157) at sun.reflect.generics.repository.FieldRepository.parse(FieldRepository.java:34) at sun.reflect.generics.repository.FieldRepository.parse(FieldRepository.java:24) at sun.reflect.generics.repository.AbstractRepository.<init>(AbstractRepository.java:56) at sun.reflect.generics.repository.FieldRepository.<init>(FieldRepository.java:30) at sun.reflect.generics.repository.FieldRepository.make(FieldRepository.java:48) at java.lang.reflect.Field.getGenericInfo(Field.java:85) at java.lang.reflect.Field.getGenericType(Field.java:223) at org.jboss.weld.introspector.jlr.WeldFieldImpl.of(WeldFieldImpl.java:52) at org.jboss.weld.introspector.jlr.WeldClassImpl.<init>(WeldClassImpl.java:155) at org.jboss.weld.introspector.jlr.WeldClassImpl.of(WeldClassImpl.java:119) at org.jboss.weld.resources.ClassTransformer$TransformTypeToWeldClass.apply(ClassTransformer.java:59) at org.jboss.weld.resources.ClassTransformer$TransformTypeToWeldClass.apply(ClassTransformer.java:50) at com.google.common.collect.ComputingConcurrentHashMap$ComputingValueReference.compute(ComputingConcurrentHashMap.java:355) at com.google.common.collect.ComputingConcurrentHashMap$ComputingSegment.compute(ComputingConcurrentHashMap.java:184) at com.google.common.collect.ComputingConcurrentHashMap$ComputingSegment.getOrCompute(ComputingConcurrentHashMap.java:153) at com.google.common.collect.ComputingConcurrentHashMap.getOrCompute(ComputingConcurrentHashMap.java:69) at com.google.common.collect.ComputingConcurrentHashMap$ComputingMapAdapter.get(ComputingConcurrentHashMap.java:393) at org.jboss.weld.resources.ClassTransformer.loadClass(ClassTransformer.java:163) ... 8 more Exception in thread "main" java.lang.IncompatibleClassChangeError: Implementing class at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631) at java.lang.ClassLoader.defineClass(ClassLoader.java:615) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at java.net.URLClassLoader.access$000(URLClassLoader.java:58) at java.net.URLClassLoader$1.run(URLClassLoader.java:197) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631) at java.lang.ClassLoader.defineClass(ClassLoader.java:615) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at java.net.URLClassLoader.access$000(URLClassLoader.java:58) at java.net.URLClassLoader$1.run(URLClassLoader.java:197) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at org.jboss.weld.environment.se.discovery.url.WeldSEResourceLoader.classForName(WeldSEResourceLoader.java:40) at org.jboss.weld.bootstrap.BeanDeployer.addClass(BeanDeployer.java:78) at org.jboss.weld.bootstrap.BeanDeployer.addClasses(BeanDeployer.java:118) at org.jboss.weld.bootstrap.BeanDeployment.createBeans(BeanDeployment.java:171) at org.jboss.weld.bootstrap.WeldBootstrap.deployBeans(WeldBootstrap.java:336) at org.jboss.weld.environment.se.Weld.initialize(Weld.java:86) at net.ezbrokerage.launcher.EzBrokerageLauncher.<init>(EzBrokerageLauncher.java:31) at net.ezbrokerage.launcher.MontereyVenueLauncher.<init>(MontereyVenueLauncher.java:45) at net.ezbrokerage.launcher.MontereyVenueLauncher.main(MontereyVenueLauncher.java:86)